Sensorised bearings in door mechanisms

Gebr. Bode & Co. GmbH, a German manufacturer of door systems for suburban trains, has selected SKF sensorised bearings for the drive mechanisms of its SST-EZ doors. A sensorised bearing plays a vital role for the doors' safety functions. It measures the speed of the doors' electrical motor drive, which a control system compares with the motor current. If the motor speed goes down at the same time that the current goes up, there can be only one reason: Something, or somebody, is stuck in the doors, and they must be opened again. So far Bode has sold more than 8,000 doors of this type to suburban railways in countries such as Germany, the Netherlands and Hong Kong.

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